This process should take 20-25 minutes depending on your computer’s hard drive speed. Once complete, it’ll prompt you to begin the update to fix errors (errors meaning files that don’t match current retail). Choose to “fix the errors”.

PlayOnline will start checking and updating files. This can take 4-6 hours depending on your computer speed and internet connection.

Once everything is updated, exit PlayOnline.

Navigate to \Program Files (x86)\PlayOnline\SquareEnix\PlayOnlineViewer (or to where you installed FFXI) and copy the \data folder. Navigate to the \Program Files (x86)\PlayOnline\SquareEnix\FINAL FANTASY XI folder and paste that folder in that folder. You should now have a \data folder in your \FINAL FANTASY XI folder.

You’re done and ready to configure your windower client with either Windower or Ashita.